Drill-bit forming and sharpening machine.



W. L.*JAGKSON. l DRILL BIT IOIIMING AND SHARPBNING MACHINE.

APPLICATION IQILED DEC.6, 1913.

Patented A111228, 1914.

FATENT WL'IER L. JACKSON, OF QUINCY, MASSACHUSETTS, ASSG-NOR OF ONE-HALF TO THEOPHILUS KING, OF QUINCY, MASSACHUSETTS.

DRILL-BYE FOBMING AND SHARPENNG MACHINE.

Speccation of Letters Patent.

Patented Aapr., 28, 1914i.

Application led December 6, 1913. Serial No. 805,031.

To all Iwhom t m cy concern,

Be it known that l, lVAL'rnn L. JACKSON, a citizen ot the United States, and a resident ot Quincy, in the county ot' Norfolk and State of Massachusetts, have invented certain new and useful improvements in Drill- Bit Forming and Sharpening Machines, ot which the following is a specification.

rl`his invention relates to means for torming and sharpening rock drill bits on hollow drill steel rods or bars.

An o ierativc drill to which my invention is related consists ot a length ot hollow or tubular drill steel one end of which is upset by a swaging operation performed by the cooperation ol' a tooth forming dolly and a tapered coniining die, the swaging operation forming a tapered or trusto-conical enlargement at one end of the drill steel and radial teeth on the outer and larger end ot said enlargement. The upset toothed portion constitutes the bit and the remaining portion the shank of the drill. lt is customary to repeatedly upset a drill ot this character to sharpen its teeth after wear or breakage ot the same, the drill as a whole being gradually shortened by successive swaging operations until its length is so tar reduced as to render it useless. rlhe drill steel rod or bar is usually polygonal in cross section while the tapered enlargement is circular in cross section, so that the drill has a polygonal shank and a bit, the perimeter' ot which is a cone Tl'rustum. In this perimeter are formed a series oit longitudinal grooves constituting vents through which the coniminuted sto-ne and dust formed by the drill teeth are forced by compressed air entering the cavity through the bore of the drill. ln operation ot' re-torming or of sharpening the bit these grooves are partially closed by the conjoint action ot the dolly and the confining die, so that it is necessary to re-'form the grooves after each swaging operation.

My invention has 'for its object to provide a simple and durable machine adapted to cooperate with an ordinary dolly in torming, ire-forming, and sharpening bits of various sizes on drill steel rods or bars of uniform size, and also adapted to form and retorm said vent grooves.

rlhe invention consists in the improvements which l will now proceed to describe and claim.

@t the accompanying drawings: Figure 1 represents a side elevation ot a machine embodying my invention comprising fixed and movable vise jaws, the movable jaw being raised. Fig. 2 represents a view similar to a portion of Fig. 1, showing the movable jaw depressed. Fig. 3 represents a section on line 3 3 ot Fig. 1 and a plan view of a portion ot the fixed jaw. Fig. 4L- represents an end elevation. Fig. 5 represents a section on line 5 5 of Fig. 2. Fig. 6 represents a side view ot a drill. Fig. 7 represents a section on line 7 7 of Fig. 6. Fig. 8 represents a section on line 8 8 of Fig. G.

rEhe same reference characters indicate the same parts in all the figures.

Referring first to Figs. 6, 7 and 8: 12 rep resents the frusto-conical perimeter ot the bit portion of a hollow or tubular rock drill to the forming and re-torming or sharpening of which the machine ot my invention is related, said bit having the usual radial teeth 13 at its larger end, and the usual tapered longitudinal vent grooves 14 in its perimeter through which stone dust and small cuttings are forced by compressed air driven through the bore 16 of the drill. 15 represents the shank portion which is usually polygonal in cross section, and, as here shown, is hexagonal. The machine comprises a tired elongated lower vise jaw 17, the upper tace ot which is provided with a series of transverse drill-receiving recesses 18 each composed ont a shank-receiving portion 18a ot polygonal torni in cross section and formed to closely tit one halt orn the shank 15, and a tapered. portion 18b of semicircular form in cross section, and formed to closely tit one halt ot the frusto-conical perimeter of the bit 12. The jaw 17 may be affixed by bolts 19 to a supporting member Q0 which may be a bench, a tree stump or any other suitable support. 21 represents a movable elongated upper vise jaw which is hinged at Q2 to liXed ears 23 on the lower jaw. The bottom tace ot the jaw 21 is adapted to bear on the upper tace ot the jaw 17 when the jaws are closed as shown by Fig. 2, and is provided with a series of recesses 18 which are formed like the recesses in the lower The two series et re vfesses coincide when the jaws are closed. llie recess portions 18a constitute elainp members which lirinly engage and prevent end wise movement oit the shank 15, the central ilaee olil each of said portions being preferably niilled or roughened to torni .shanlvengaging teeth 18. The recess portions itil) torni the iueinbers of a trusto-ooniral die corresponding in shape to the periinot `the bit l2. the recess portions 18 e oi ini'liorin size throughout the series, reces portions 18h vary in size bout the series, as shown by Figs. l, 1, so that bits ot' Various sizes niay be and re-iiorined or sharpened, on st 1el bars or rods oi" a given uniforin ln practice, the bit portion ot the drill is suitably heated7 the drill is placed in the proper recess 18 in the lower jaw, and the upper jaw is closed upon the lower jaw and eonlined by ineans hereinafter described. A dolly (not shown) of suitable forni is then applied to the serrated end of the bit and is liai'uinered by any suitable ineans until the heated bit is accurately eontornied to the torining races of the dolly and the die portions le ot' the jaw recesses, the tapered periineter oit the bit being` slight-ly separatediiroin the die portions 18h at the coininencenient ot the operation as indicated by dotted lines in Fig. 5, that the nietal displaced by the swaging action olf the dolly progresses rearv rl until it is arrested by the die por` tions 18'). During this operation endwise prevented by movement et the shank l5 the recess portions 18a which rinly grip the shank.

lhe upper jarv Q1 is iiorinally held yield ingly separated t'roin the lower jaw 17, preterably by a counter weight 25 inounted on an arin QG 'forined on or attached to the inner end portion oi" the upper jaw. Said weight niay be adj ustably secured to the arin QG by a bolt QT passing through a longitudiial slot (Fig. l) in the weight. it spring may be provided for this purpose ii desired. conline the upper jaw against the lower jaw l prefer to employ a lever if) pivoted or inounted to oscillate ou a pin 3UL which. is journaled in vertically adjustable bearings lill supported by lined stancards 3Q at opposite sides ot the path of the vinging end ot the upper jaw. The lever QS) has a cani shaped shorter arin 30: the curved tace of which a liinited transverse bearing on the n er pL jaw and is adapted7 in moving troni th ,f `iosition shown by Fig. l to that snown hv Fig. to Vlerne the upper jaw against t ie lower jaw.

'lhe lever arin 30 is preferably provided with an antif'iariction roll. 3l which constitutes tle acting portion oit the arin and i, transinii",-f downward pressure to the upper during the latter part ot the above dez i l i i i i i roe/ieee scribed movement ol the lever, the periphery ot the roll having a narrow transverse bearing on the upper jaw. Stop ineinbers are provided which arrest the arni 30 when it reaches the position shown by llig. 2, the transverse line ot contact ot the roll with the upper jaw (indicated by the reference letter y) being at the inner side ot a pei'iiiendicu.- lar line drawn lroin the center of the tulcruin or pivot 30a so that displacement oit. the arin 30 trein its jaw-holding position by the upward pressure olf the upper jaw against it is prevented. Said stop ineinbers as here shown, are formed by the closed inner ends of slots 33 toi-ined on the inner sides et the standards 32, and by the projecting ends ot the stud 34twhieh connects the roll 3l to the arin 30, said stud ends entering the slots and abutting aga-inst the closed ends thereof. rllhe bearing blocks 3l are vertically adjustable in slots 3G in the standards 82 and niay be supported at dit'- terent heights by shiins 8.7 interposed between the upper ends of the standards and ears iliorined on the blocks ll Bolts 58 secured to the standards 32 and passing through the said ears and shiins hold the blocks 81a in any position. to which they may be adjusted. Provision is thus inade tor compensating for wear oill the contacting parts ot' the arin SO and the upper `aw.

The described swaging operation tends to partially close the vent grooves .ll in thV drill bit. To enable these grooves to be conveniently and quickly re-orined, l provide a pair ot wedge shaped grooving dies 4:0 bearing on seats il which are offset troni toe meeting faces ot the jaws 17 and 2l., so that the dies do not strike each .other when the jaws closed, the lower die being adapted to enter a groove lll in the under side oit a bit held upon it as indicated by dotted lines in Fig. l. llileans are provided for quickly and forcibly depressing the upper jaw and its grooving die 40, and thus causing the latter to enter a groove ifi in the upper side ot the bit` so that two grooves are siinultaneously torined or opened by said dies. The preferred jaw-depressing ineans comprise a lever ti'ulerunied at les to a fixed support and having a tiea dle 4i-5 on one ot its arins, and a rod t0 connecting the other arni ot' said lever with the arni 2G on the upper aw. The depression oit the treadle therefore causes a downward inoveinent of the outer end of the upper jaw7 and the described aetion of the dies 4:0 on two grooves in a bit. fitter these grooves have been torined the bit inay be partially turned to subject two other grooves to the action of dies, and so on until all ot the formed there being usually sir; each bit.

The described inachine is particularly adapted for use in quarries and other places the grooving where improvised or portable supports Jfor the lower jaw are required, said jaw being readily attachable either to a portable bench or to an improvised support such as a tree stump.

l claim l. A drill bit forming and sharpening machine comprising an elongated fixed vise jaw having a plurality of transverse drillreceiving recesses, an elongated movable vise jaw hinged tothe fixed jaw and having complemental transverse recesses arranged to register with the recesses of the fixed jaw when the jaws are closed, the movable jaw being normally separated from the fixed jaw, and means for confining the movable jaw against the fixed jaw, said recesses having polygonal drill shank-engaging portions of uniform size. and end portions constituting frusto-conical forming dies of different sizes, whereby bits of different sizes may be formed on shanls of a uniform size.

A drill bit forming and sharpeningV machine comprising an elongated fixed vise jaw having a plurality of transverse drillreceiving recesses, an elongated movable vise jaw hinged to the fixed jaw and having complemental transverse recesses arranged to register with the recesses of the fixed jaw when the jaws are closed, the movable jaw being normally separated from the fixed jaw, and means for confining the movable jaw against the fixed jaw, said recesses having polygonal drill shank-engaging portions of uniform size and end portions constituting frusto-conical forming dies of different sizes whereby bits of different sizes may be 'formed on shanlrs of a uniform size, the said polygonal recess portions being provided with ronghened faces adapted to preventondwise movement of a drill shank conlined in said recesses.

el drill bit forming and sharpening machine comprising an elongated fixed vise jaw, an elongated movable vise jaw hinged to the fixed jaw, said aws having meeting faces provided with transverse shank-holding and bit-forming recesses, means being provided for yieldingly pressing the movable jaw upwardly from the fixed jaw, standards on the fixed jaw at opposite sides of the path of the outer end portion of the movable jaw, provided with stop members at their inner sides, and a lever pivoted to said standards and having a cam shaped shorter arm bearing on the movable jaw and adapted to depress the latter into contact with the lower jaw, said shorter arm being provided with stop members cooperating with the stop members o-n the standards to arrest the jaw-depressing movement of the lever when the bearing of the shorter arm on the movable jaw is at the inner side of a perpendicular line from the axis of the lever, whereby displacement of the lever by the upward pressure of the movable jaw against` it is prevented.

4:. A drill bit forming and sharpening machine comprising an elongated fixed vise jaw, an elongated movable vise jaw hinged to the fixed jaw, said jaws having meeting faces provided with transverse shank-holding and bit-forming recesses, means being provided for yieldingly pressing the movable aw upwardly from the fixed aw, standards on the fixed jaw at opposite sides of the path of the outer end portion of the movable jaw, provided with stop members at their inner sides, a lever pivoted to said standards and having a cam shaped shorter arm bearing on the movable jaw and adapted to depress the latter into contact with the lower jaw, and means .for vertically adjusting the fulcrum of said lever to compensate for wear.

ln testimony whereof I have affixed my signature, in presence of two witnesses.

VALTER L. JACKSON.

V'Vitnesses C. F. BROWN, l). TW. Pnzznr'r.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Eatents,

Washington, D. C. 

